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Leases Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Schedule of Lease Assets and Liabilities [Line Items] |  |  |
Guarantee Obligations | $ 164 | $ 299 | $ 179
Minimum [Member] |  |  |
Schedule of Lease Assets and Liabilities [Line Items] |  |  |
Lessee Operating and Finance Leases, Remaining Lease Term | 1 year |  |
Maximum [Member] |  |  |
Schedule of Lease Assets and Liabilities [Line Items] |  |  |
Lessee Operating and Finance Leases, Remaining Lease Term | 53 years |  |
Residual Value Guarantee [Member] |  |  |
Schedule of Lease Assets and Liabilities [Line Items] |  |  |
Guarantee Obligations | $ 103 |  |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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- Details
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